
<p><b>syntax:</b> <i>starttls <b>on | off | only</b></i>
</p><p><b>default:</b> <i>off</i>
</p><p><b>context:</b> <i>mail, server</i>
</p>
<ul><li> on - permit the use of commands STLS for POP3 and STARTTLS for IMAP/SMTP
</li><li> off - do not allow command STLS/STARTTLS
</li><li> only - announce STLS/STARTTLS support and require that clients use TLS encryption
</li></ul>
<br><i>Module: NginxMailSslModule</i>